Internal vs External Quality

External Quality Characteristics: 
care u air
Correctness, Usability, Efficiency, Reliability, Integrity, Adaptability, Accuracy, and Robustness.

Internal Quality Characteristics: 
mut r pr
Maintainability, Flexibility, Portability, Re-usability, Readability, Testability, and Understandability.



Good Links:
https://meekrosoft.wordpress.com/2010/10/31/internal-and-external-software-quality/

http://c2.com/cgi/wiki?InternalAndExternalQuality